aaron-he-zhu/aaron-marketing-skills · email/engage/subject-line-lab/SKILL.md
subject-line-lab skillA
Use when the user asks to "generate subject line variants", "pre-score my subject lines", or "will this subject get truncated / trigger spam filters"; produces a labeled subject + preheader variant set and a per-variant heuristic pre-score card — spam-trigger flags, length/truncation across desktop + mobile, emoji-count, and the inbox preview render (from-name + subject + preheader) — before any test is run. Not for the body copy or CTA — use email-creative-builder; not for the A/B test design o
Latest version
mdr add aaron-he-zhu/aaron-marketing-skills/subject-line-lab@v20.1.0Exact content
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[](https://markdownregistry.com/a/art_2t6apukgkmh7l4qf)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v20.1.0 latest | 2026-09-01 | 0c914b1 | 14,458 B | A | view · diff |
| v20.0.0 | 2026-08-20 | 879002a | 14,458 B | A | view · diff |
| v19.2.0 | 2026-08-10 | d09dd90 | 14,458 B | A | view · diff |
| v19.1.0 | 2026-08-01 | f744424 | 14,458 B | A | view · diff |
| v19.0.0 | 2026-07-24 | 407137c | 14,458 B | A | view |
Audit of the latest version
A 17 of 17 checks passed. Deterministic, no model, same answer every run.
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (14458 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
GitHub
aaron-he-zhu/aaron-marketing-skills · 2,731 stars · license Apache-2.0 · pushed 2026-09-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_2t6apukgkmh7l4qf GET https://markdownregistry.com/api/v1/resolve?ref=aaron-he-zhu/aaron-marketing-skills/subject-line-lab GET https://markdownregistry.com/api/v1/blob/6b7431ad52a51543abc5d67bb1c822495243cf17d255a036d729b9a1a2af3a5d